For cesarean sections regional (spinal) anaesthesia is preferred unless there are contraindications to it or there is dire emergency where there isn't enough time for administration of regional anaesthesia. Every procedure comes with pros and cons. So does general anaesthesia. There can be a varied set of reasons for backache with spinal anaesthesia which may not be directly related to it. You can discuss this issue with your gynaecologist and the anaesthesia consultant prior to your cesarean section and decide accordingly.

No never ask for general ....Your baby too will be getting the anaesthesia and many post op effects ....You can't feed for many hours. Always Spinal anaesthesia is the best and preferred anywhere in the world. Getting back pain after spinal anaesthesia is a myth...Please don't believe it. Back pain is due to pregnancy perse because of stretching of ligaments and muscles.....Not due to a small prick. It's ridiculous how people presume things.